The examination will take place in the left lateral position to improve image quality and prevent obstruction of the inferior vena cava. A GE echocardiography machine will be used. For each acquisition, 3 cardiac cycles will be stored and analysed offline (after the examination) with Centricity Electronic Medical Records software developed by GE at a workstation at the Department of Anaesthesia/Cardiology. All echocardiographic assessments and offline analysis will be performed by one experienced investigators without blinding. Thereafter a second experienced investigator will review the images independently offline.